all was working fine with my domain email in thunderbird, until, I transferring everything to a new server. New server has same hostname and even same mail servers, however, when I try and enter it into thunderbird, it says failed to connect to server. RoundCube in browser works fine.

Staff Member

Have you tried removing the account in Thunderbird and adding it back to see if the issue continues? Have you checked to make sure the email account (e.g. mail server name) is configured correctly in Thunderbird?